diff --git a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ErrorResponse_WorkHistory.md b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ErrorResponse_WorkHistory.md
index 0a31f5f..e55730c 100644
--- a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ErrorResponse_WorkHistory.md
+++ b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ErrorResponse_WorkHistory.md
@@ -5,7 +5,7 @@
 ### 목표
 모든 HTTP 에러 응답을 다음과 같은 표준 JSON 포맷으로 통일:
 ```json
-{"error":{"code":"에러코드","message":"에러메시지"}}
+{"error":"에러코드","error_description":"에러메시지"}
 ```
 
 ## 변경 내역
@@ -15,7 +15,7 @@
 
 - 표준 에러 응답 포맷 정의
   ```java
-  public static final String ERROR_MESSAGE_DEFAULT_FORMAT = "{\"error\":{\"code\":\"%s\",\"message\":\"%s\"}}";
+  public static final String ERROR_MESSAGE_DEFAULT_FORMAT = "{\"error\":\"%s\",\"error_description\":\"%s\"}";
   ```
 
 - 에러 코드 상수 추가
@@ -197,7 +197,7 @@ out.println(jsonErrorMessage);
 
 **검증 항목**:
 - HTTP 상태 코드 정확성
-- 응답 포맷이 `{"error":{"code":"...","message":"..."}}` 형식인지 확인
+- 응답 포맷이 `{"error":"...","error_description":"..."}` 형식인지 확인
 - 에러 코드가 적절히 매핑되는지 확인
 
 ## 에러 코드 매핑
diff --git a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ExceptionHandler_Test.md b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ExceptionHandler_Test.md
index d0e7546..3d1cb0e 100644
--- a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ExceptionHandler_Test.md
+++ b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/EAPIM_ExceptionHandler_Test.md
@@ -5,7 +5,7 @@
 
 **에러 응답 포맷**:
 ```json
-{"error":{"code":"에러코드","message":"에러메시지"}}
+{"error":"에러코드","error_description":"에러메시지"}
 ```
 
 ## 테스트 케이스
diff --git a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/ErrorResponseValidator.java b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/ErrorResponseValidator.java
index e249dbe..032ea78 100644
--- a/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/ErrorResponseValidator.java
+++ b/kjb-errors/src/test/java/com/eactive/eai/kjb/errors/ErrorResponseValidator.java
@@ -8,7 +8,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 
 /**
  * MessageUtil.makeJsonErrorMessage 기본 포맷 검증 유틸리티
- * 기본 포맷: { "error" : {"code":"%s","message":"%s"} }
+ * 기본 포맷: {"error":"에러코드","error_description":"에러메시지"}
  */
 public class ErrorResponseValidator {
 
@@ -24,15 +24,10 @@ public class ErrorResponseValidator {
 		assertNotNull(jsonNode, "JSON 응답이 null입니다");
 
 		assertTrue(jsonNode.has("error"), "error 필드가 존재해야 합니다");
+		assertTrue(jsonNode.has("error_description"), "error_description 필드가 존재해야 합니다");
 
-		JsonNode errorNode = jsonNode.get("error");
-		assertNotNull(errorNode, "error 객체가 null입니다");
-
-		assertTrue(errorNode.has("code"), "error.code 필드가 존재해야 합니다");
-		assertTrue(errorNode.has("message"), "error.message 필드가 존재해야 합니다");
-
-		assertNotNull(errorNode.get("code").asText(), "error.code 값이 null입니다");
-		assertNotNull(errorNode.get("message").asText(), "error.message 값이 null입니다");
+		assertNotNull(jsonNode.get("error").asText(), "error 값이 null입니다");
+		assertNotNull(jsonNode.get("error_description").asText(), "error_description 값이 null입니다");
 
 		// 검증 성공 시 Pretty Print
 		String prettyJson = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(jsonNode);